ARE THESE ANY GOOD?

Manzo Manifold Exhaust Header Fits Mustang 05-10 4.0L V6 245 CID SOHC Non GT

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They look well made and are 304 stainless steel. The question is how well they fit and there's only one way to find out.
Don't expect more than a 5hp gain. Shorties tend to add more torque at lower rpm and improve the sound compared to the stock manifolds.

 

If you take a good look at your factory exhaust manifolds on your 4.0, you'll see they are pretty much shorty headers. Like Dino Dino Bambino said, "you'll probably add 5 horsepower" .

 

Waste of money but they look good. Lot of trouble for pretty much no performance gain.

 

Yup, albeit with much shorter runners.

https://www.autopartone.com/products...t-manifold-set

 

True but the 4.0 exhaust manifolds look a lot better than the factory ones on my 2011 3.7 .

 

Yeah, the 3.7 exhaust manifolds look very similar to those on the 4.6 3V. Their streamlined design is a lot better than the older log type manifolds but they're still restrictive in terms of flow. Mid-length shorty headers (e.g. JBA, BBK) offer some benefit on these engines with torque gains mainly at low/medium rpm, and can be worthwhile in states where long tube headers are illegal.

 

To the OP, you will probably pick up some much needed low end HP and Torque, the 3.7 does a better job with Shorties but the 4.0 still makes gains
I have Short Tube BBK's on my 3.7 and there was substantial gains in the lower to mid RPM and truthfully wish they had Short tubes for the F150 6.2. Dino, what state are Long tubes legal in since the law being broken is Federal on moving your Cat from their OEM location. There are just states where you can get away with long tubes.

 

You can get away with anything in Indiana. No inspections or emissions testing. Just watching this thread for information. Carry on!

 

Agree. I supposed it should be equal in length pipes